Vol. 41, pp. 211-214 December 18, (kzs 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF SIX NEW NORTH AMERICAN 

 GROUND SQUIRRELS. 



BY ARTHUR H. HOWELL. 



A revision of the North American ground squirrels, now in 

 progress, has revealed a number of new races, which are here 

 briefly described in advance of a more formal paper. 



Citellus townsendii brunneus, subsp. nov. 



IDAHO SPOTTED GROUND SQUIRREL. 



Type. — Female adult, skin and skull No. 201,963, U. S. National Mu- 

 seum (Biological Siu:vey collection); collected at New Meadows, Adams 

 County, Idaho, July 11, 1913, by L. E. Wyman; original number 178. 



Suhspecific characters. — Similar to Citellus t. townsendii, but color of 

 upperparts more brownish (less grayish), and the dorsal spots smaller; 

 cinnamon patch on face darker and more extensive; ears much larger, 

 raised conspicuously above the crown; tail darker above; skull averaging 

 larger and relatively broader. 



Measurements. — Type: Total length, 224; tail vertebrae, 61; hind foot, 

 32. Skull. — Average of 4 adult males from Weiser and Midvale, Idaho: 

 Greatest length, 40.4 (39.8-40.8); zygomatic breadth, 25.5 (24.9-26.1); 

 breadth of cranium, 18.4 (18.3-18.5); least interorbital breadth, 8.4 

 (7.5-9.2); least postorbital breadth, 10.8 (10.4r-11.6); length of nasals, 

 15 (14.6-16.1); maxillary tooth row, 8.5 (8.4-8.8). Adult female (type): 

 38.2; 24; 17.2; 8.1; 9.5; 13.4; 7.5. 



Range. — ^West-central Idaho; specimens examined from Weiser, Mid- 

 vale, Goodrich, Van Wyck, and New Meadows. 



Citellus elegans nevadensis, subsp. nov. 



Type. — Female adult, skin and skull. No. 156,788, U. S. National 

 Museum (Biological Survey collection); collected at Paradise, Humboldt 

 County, Nevada, March 3, 1908, by Stanley E. Piper; original number 112. 



Svhspeafic cftorocJers.— Similar to Citellus e. elegans, but larger, with longer 

 tail and hind foot; upperparts averaging more grayish (less brownish) 

 especially on head and shoulders; underparts darker buff; skull larger, 

 but postorbital breadth less. 



50— Pboc. Biol. Soo. Wash., Vol. 41, 1928. (211) 



